# Measurement of the associated production of a single top quark and a Z boson in pp collisions at $\sqrt s$ = TeV

## Abstract

A measurement is presented of the associated production of a single top quark and a Z boson. The study uses data from proton–proton collisions at $\sqrt s = 13TeV$ recorded by the CMS experiment, corresponding to an integrated luminosity of $35.9 fb^{−1}$. Using final states with three leptons (electrons or muons), the $tZq$ production cross section is measured to be $\sigma(pp\rightarrow tZq \rightarrow Wb\ ℓ^+ℓ^- q)= 123^{+33}_{-31} (stat)^{+29}_{-23}(syst) fb)$ , where ℓ stands for electrons, muons, or $τ$ leptons, with observed and expected significances of 3.7 and 3.1 standard deviations, respectively.

## Abstract

A measurement is presented of the associated production of a single top quark and a Z boson. The study uses data from proton–proton collisions at $\sqrt s = 13TeV$ recorded by the CMS experiment, corresponding to an integrated luminosity of $35.9 fb^{−1}$. Using final states with three leptons (electrons or muons), the $tZq$ production cross section is measured to be $\sigma(pp\rightarrow tZq \rightarrow Wb\ ℓ^+ℓ^- q)= 123^{+33}_{-31} (stat)^{+29}_{-23}(syst) fb)$ , where ℓ stands for electrons, muons, or $τ$ leptons, with observed and expected significances of 3.7 and 3.1 standard deviations, respectively.

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